Which is the Best Slideshow Software Available?

I have spent a lot of time scouring the internet trying to find the best slideshow software that is available. It’s not been easy as there is plenty of software available, both free and paid, but finding the best software that met my needs wasn’t that easy.

Really, I don’t mind paying for software, within reason, but it has to fulfill all of my criteria if I’m going to be laying out my hard earned cash for it.